Calcining-furnace.



G. MOORE.

CALCINING FURNACE.

APPLICATION F1150 1111111.16, 1914.

Georg fm UNITED STATES PATENT oEE-IoE.

GEORGE MOORE, OF JOPLIN, MISSOURI. I

cALcININe-FUENACE.

Vin calcining furnaces adapted especially for production of Portland cement, and the object in view is the advantageous disposal of light solids discluu'gingvfrom the furnace with the chimney gases.

A further object in view is the disposalI of such solids economically1 and eliiciently by returning the same to be retreated, such return being rendered practicable by the utilization o'f the waste heat of the furnace.

Vith these and further objects in view, as will in part hereinafter become apparent and in part be stated, the invention comprises certain novel constructions, combinations and arrangements of parts as will be herein` after specified and claimed.

In the accompanying drawing, Figure 1 is a diagralnmatical showing of a structure embodying the features of the present in.-y

vention, parts being seen in section. Fig. 2 is a transverse, vertical section through the structure taken on the plane indicated by linev2-f-2 of Fig. 1. Fig. 3 is a section taken onthe plane indicated by line 3-3' of Fig. l. y Fig. 4 is a detail fragmentary plan.

vReferring to the drawings by numerals, 1 indicates the usual rotary drum of the furnace which, vas seen inthe drawing, consists of an inner-wall or liningof brick or other appropriate refractory material, and an outer metallic casing. Drum -1 is supplied with an outer, smooth metallic casing 1 covering seams, joints, and rivets, so as to present an unbroken surface `for reasons herein rendered obvious. The drum inclines from its intake end to its discharge end, the upper or intake end being supplied with material to be calcined through a supply tube 2 .having the usual feed screw disposed to receive ma terial from a supply hopper 3, the said lin-V take end of thedrum opening' into a flue 4 into which the carbonio acid and other gases arey discharged. The usual oil or other fuel apparatus 5 discharges into the lower or (.lrain'through valved 'specifica-noa of Letters Patent. Patented Mar, 7, 1916 Application' area March 1e, 1914. .serial Np. $25,022.

'discharge end of the furnace drum 1, and

the drum is revolved by the usual gearing 6 vided with the usual annular tracks 7 travcling on anti-friction rollers 8.

F lue l extends downwardl and dischargesV into a cleansing'chamber. 9, w iich in turn discharges into a stack 10. A sprinkler 11 discharges a constant water shower across the path of the iiue products so as to cause ythe light solids therein to be precipitated, and these collecting at the bottom of chamber 9,

pump 15 from which the solids and yWater are forced up pipe 12 to a settling tank 17. Sprinkler 11 consists of a tank having a perforated bottom. l

Pipe 12 directsits discharge into the upper end of a quieting cylinder' or tubular baille 19, preferably provided with a reticulated baille plate 20 for spreading the discharge and tending to quiet the movement vthereof 'so that the inliowing liquid in passing beneath the lower edge of the druln 19 and entering the main body of water in the settling or thickeningtank 1T will not materially interfere with the gravitation of solids to the bottom of the tank. The solids settle by gravity into the bottom of tank 17,'which is of the hopper type, `and is provided with a discharge pipe 21 at its apex.

The pipe 21 is valved for controlling the rate of discharge therethrough, so that the solids may be discharged `preferably in a continuous stream, but with a minimum admixture of water.v The clear water rises to the upper portion of tank 17 and discharges into a discharge trough 22 arranged about the upper edge of the tank 1T. The water discharging into trough 22 is directed back disch-arge pipe 16 into to the sprinkler 11 through a pipe lf-l. Adt ditional water is also supplied to sprinkler 11 through a pipe 13, from a source not illustrated, to compensate for that lost with the thickened solids.

The solids discharging through pipe 21 are delivered to a distributing Pipe 26 extendsalong drum 1 just above the same, and is provided with spaced apertures 27 for the disch: rge ofsolids down upon thev drum 1, for being dried by the waste heat thereof. There are no apertures 27 adjacent those portions oi' pipe 2G above the tracks 7.

Y The solids in pipe 26 are accompanied by suiicient waterf'fo remain fluid until they pipe 26. i

strike drinn l` The solids rapidly dry after contacting with drinn l, so that before any particular portion of thc solids completes a revolution itis dried. but has suliicient adhesion to the metal casing to support its weight during movement of the drum. The incrusted solids are readily scraped olfof the drum when brought into engagement with a scraper blade 2H, which blade is pivotally supported. as by a rod 2H, and sustained by a counler-balance weight Il() in engagement with thi` surface of the drum. Rod 2S) is sustained b v spaced frames 1221', and scraper 1H is divided into sections terminating short of the tracks i. and each section has its weight 2li). lrct'eiaibly an outside casing is provided for drinn l to give a smooth siii'- t'acc for the .scrapersl to contact with, thus. avoiding the rivets and hips of the usual kiln. i

Extending longitudiiuilly throughout the length of thedruni 1 and beneath tlieline of the scraper blade 2h' is an endless coii veyei belt til supported on appropriate rollers and driven by a drinn disposed at one terminus of the convejier, the drinn being carried b v a drive `shaft receiving power through gearing ll actuated by chain belt il! extending about the drinn 1. )it that end of the conveyer Ill nearer the hopper-3. the conveyer discharges into the buckets of an elevator :lo which convey the solids to a cnil of conveyer 3l nearer the hopper 3. The conveyer El?) is driven by gearing actuated by drinn l, and the several buckets ofthe conveyer dip successively into a well or pocket Sti' into which the coiiveyer 3l discharges.

The operation will be. understood from the foregoing and may be briefly stated as follows: The raw material is continuously supplied through pipe 2, the drinn l continuously rotateihand the fuel ciintinuously supplied through pipe 5, so that as the ma terials are sufficiently calcined they fall in the forni of powder from the lower end of drum l while the gases and certain light solids escape out through line l; The shower from sprinkler 11 is maintained continuously.` The solids forced up by pump l5 are collected in the bottoni of tank 17 and delivered therefrom with as small proportion of water as practicable into pipe 2G from which the wet solids are discharged in a manner for effectively utilizing the waste heat of the drum in drying the solids and thus restin'ing` the samei to a condition adapting themto be refedlo the furnace.

1. In a calcining furnace. the combination with a furnace proper, oii means for discharging hydrating wasteisolids in a `sheet against the exterior of the furnace in quantities substantially only su ficient foi requirn ing the waste heat of the furnace for drying.

In a calcining furnace, the combination with a furnace proper, of a pipe extending along the furnace above the same, and having discharge apertures opening toward the furnace, and means for delivering hydrated solids to the pipe, the apertures in the pipe being proportioned to permit discharge of such solids on to the furnace in quantities substantially only requiring the waste heat of the furnace for drying.

3. In a calcining furnace, the combination with a furnace proper, of means for direct ing hydrated waste solids and discharging the saine down onto the exterior of the fui'- nace for heilig dried by the waste heat thereof. i i

4. In a calcining furnace.` the combination with a furnace proper, of a conductor disposed above the furnace and having means of discharge directed toward the furnace and proportioned to deliver hydrated solids in quantities substantially only requiring the waste heat of the furnace for drying, and means for delivering hydrated waste solids to the conductor.

In a calcining furnace, the combination ofa furnace proper, a pipe extending along and above the fornaci and having discharge apertures opening toward the furnace, and means for delivering hydrated solids in a fluid condition to the pipe imder pressure suliicient for insuring discharge through the apertures at a rate proportioned to deliver hyilrated solids in quantities substantially only requiring the waste heat of the furnace for drying.

(i. In a calcining furnace, the combination with a furnace proper, of means for sutilciently hyd 'ating waste solids therefrom for .producing a fluid' mass, means for separating solids and fluid by gravity, and means for dr'ing the separated solids by the waste heat of the furnace.

7. In a calcining furnace, the combination with a rotary furnace drum, of means for hydrating solids in gases discharged from the drum for removing the solids therefrom, a pipe extending along and above the drum,

and having discharge apertures directed to-` ward the drinn, and means for supplyingI the hydrated solids to the pipe, the discharge apertures of the pipe being proportioned to supply hydrated solids in quantities siibstantially only requiring the waste heat of the drum for drying.

8. In a calcining furnace, the combination` with a `rotary furnace drinn, of means for hydrating solids in` gases discharged from the. drum for removing such solids from the gases, means for spreading the solids on upper portions of the drum for drying same, and a scraper disposed to engage the drum for removing dried solids incident to the motion of the drum.

9. In a calcining furnace, the'combnation with a furnace proper, and means for supplying material thereto, of means for hydrating solids in gases discharged from the furnace for removing such solids from the gases, means for spreading the solids on upper portions of the furnace for drying ,the same, means for removing the dried solids, and conveying means for returning the dried solids to the material supply means for the furnace.

10. In a calcining furnace, the combination with a furnace proper, of means for hydrating Waste solids therefrom, of a clarifying tank, means for delivering the' hydrated solids to the tank for gravity separation from the moisture, and means for` delivering the solids from the tank to be dried by the Waste heat of the furnace.

11. In a calcining furnace, the combination with a furnace proper, of means for sufficiently hydrating Waste solids from the furnace for producing a fluid mass,y means for separating solids and fluid by gravity, means for drying the separated solids by the Waste heat of the furnace, and means for conveying the dried solids back to the furnace.

12. In a calcining furnace, the combination with a rotary furnace drum, of means for hydrating solids in gases discharged from the drum for removing the solids from the gases, a pipeextending along and above the drum, and having discharge apertures directed toward the drum, means' for separating the hydrated solidsfro-m water by gravity, and means for delivering the separated solids to said pipe.

13. In a calcining' furnace, for the `manufacture of Portland cement, the combination, with a. rotary furnace drum, of means for hydratng the Waste solids from the drum for recovering such solids, means for applying the hydrated solids in a fluid state on to the vdrum in quantities .sufficient to substantially only require the Waste heat of the drum for drying the solids, and means for continuously removing solids dried on the drum for clearing the surfaces of the drum for the reception of a fresh supply of the Huid mass.

14. In a calcining furnace, for the manu-- facture of Portland cement, the combination, with a rotary furnace drum, of means for hydrating the Waste solids from the drum for recovering such solids, means for applying the hydrated solids in a fluid state on to the drum in quantities sufficient to substantially only require the Waste heat of the drum for drying the solids, a scraper disposed to engage the drum and continuously remove dried solids therefrom for providing clean surfaces for the reception of a fresh supply of fluid mass, and a conveyer'disposed along the drum beneath the line of the scraper for removing dislodged solids.

15. -The combination, with va furnace, of

means for h drating Waste 'solids therefrom and recovering the solids in the form of a viscous mass, means disposed entirely eX- terior of the furnace for discharging the viscous mass down on to the exterior of the furnace in the form of a relatively thin sheet and in quantities suficient to substantially only require the Waste heat of the furnace for drying the solids, and means for removing the solids from the furnace when dried.

In testimony whereof I affix my signature in presence of two Witnesses.

.GEORGE MOORE. Witnesses:

N. CURTIS LAMMoND, E. E. DAY. 

